Javascript arrays have an inArray() method that tests for the existence of a search object and returns its key. However, sometimes you don’t want to test for an exact match. I wrote a little function that will test a regex instead. Like inArray() it returns -1 if none of the elements satisfy the condition.
function regexInArray(search, arr) { for (var k = 0; k < arr.length; k++) { if (search.test(arr[k])) { return k; } } return -1; }
I’ve been doing a bunch of PHP programming the last few weeks for a client and it’s been such a pain to use PHP’s archaic array_* methods. And don’t get me started on having to return arrays like array('result' => 'not_ok', 'message' => 'User not found') to indicate success or failure. I had some time to kill at the airport yesterday, so today I am happy to bring you BFCollections. The collections included are:
If there’s interest I’ll see about improving them and even adding additional collections.
I was just pounding my head against what turned out to be a simple Javascript misconception that I hope I can save people from: in tests for the existance of a key, not a value, in an object or array. So the following work:
var myObj = {1: "one", 2: "two"} 1 in myObj // -> true 2 in myObj // -> true var myArr = [1, 2] 0 in myArr // -> true 1 in myArr // -> true
But you might be surprised at the following results (I was):
2 in myArr // -> false
That is because myArr has values 1 and 2 at keys 0 and 1, respectively. To test the existence of a value in an array, you need to use indexOf. For instance:
myArr.indexOf(1) // -> 0 myArr.indexOf(2) // -> 1 myArr.indexOf("doesn't exist") // -> -1
As you can see, -1 indicates the value does not exist in the array.